Zaccaria Mari, the head archaeologist on the site of the Villa, started to dig outside the main complex in 2000 on a hunch that he would find a new gateway into the complex. He uncovered a piazza marking the main entrance to the villa coming from Rome and the original rectangular flagstone driveway that leads to carriage garages, but he also made what is being called the most important recent discovery in the region. He uncovered in the area where in the 18th century a statue of Antinous as Osiris was found the remains of a temple dedicated to Antinous and Osiris, the Antinoeion. The temple complex consisted of a 30 metre wide columned semi-circle behind two rectangular temples, flanked by a nymphaeum with niches and fountains. The finds included a seated statue in grey granite of the Pharaoh Rameses II, which Hadrian probably had transported from Memphis. Also found were fragments of other Egyptian statues, including one of Antinous himself, portrayed as Osiris, which they say corroborate their claim. Mari said, his team was still trying to ascertain whether the structure was simply a memorial temple or whether it could have been built to host the young lover's bodily remains. The fact that it was dedicated to Antinous, however, was being viewed as a certainty.

Innerhalb dieser Anlagen soll unter anderem auch (zu mindestens zeitweise) der Antinoos Obelisk gestanden haben (siehe Rekonstruktionen), der heute auf dem Monte Pincio in Rom steht.